Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5aafb35e5fbc9e…

MALICIOUS

PDF

37.5 KB Created: 2020-11-03 05:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52826862c65fdf06a1d79300ecbcc30f SHA-1: d4485e914bd0ad1efb67422e669ad5f3b2f5e80f SHA-256: 9e5aafb35e5fbc9ec348b8dfd5f9b4b538169ca40c7fac3a4640c64a9a3a114e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains URLs that are also present in the heuristics. No scripts were extracted, but the primary malicious activity appears to be the distribution of links to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=jim+beam+suite+yankees+stadium In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f991818f2550.pdfIn PDF document text
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/zalisakivafe-fonoduvezuruj-kiradute-jelitixaponuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f91c6c48b8da.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/disuzolamawusiva.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/5863258.pdfIn PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/1773360.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/78ad6617.pdfIn PDF document text
    • https://kopadababipa.weebly.com/uploads/1/3/4/5/134502609/37341368dc.pdfIn PDF document text
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/kemidavuvipizuvuwego.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/tuluwe_pukixideti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/100_year_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5651/9585/files/radioiodine_therapy_for_hyperthyroidism.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/parque_de_diversiones.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54AE 5136 bytes
SHA-256: 473a135fc8adf11ee9b511a5ccbba9c97950c3d88404f239c1b09343aab3d964
font_01_sfnt_off00006620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 10296 bytes
SHA-256: 2c28f4b6f70b3215e0b36da90287814337bf20ec1218cba4727b682a0c3dc784

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